As a Software Engineer
I want agile bros to fucking understand the amount (scope) of work their stupid user stories contain. So that I don't have to rant about it and go back and forth between 10k people to figure out what the fuck they want.

Pinning your happiness to change in others is a losing strategy.

Instead, create a label for "requires grooming", and when you get one, label it and bring it up in the next grooming session.

If you don't have grooming sessions, add a new meeting for Grooming x, and in the description write "required for work to continue". Add the real stake holders only, and pin it to 15/30 minutes.

Don't follow, lead. A juniors job is to provide value to the business by learning. A seniors job is to provide value to the business by doing. And a staff/principal/architects job is to provide value to the business by leading.

as opposed to waterfall requirements reading and estimation?

As long as they add a description they're already ahead of some people that are considered key figures...